Correction for the size of a Playing Card
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How big is 966.40 square millimeters?
It's about one-fifth as big as a Playing Card
The size of a Playing Card is about 5,600 square millimeters.
(ISO 216 B8 size)
A single ISO 216 B8-size playing card measures 5,600 square millimeters. Although this size is the most common playing card, many casinos use the smaller "bridge size" card — 2,604 sq. mm smaller.